Mac Pro Loses PCI graphics card connection after sleep

hi, I picked up a 2nd hand 2009 Macpro for the equivalent of $100USD, it was marked as non working.
After I put in my own RAM and Video cards everything seems to be running properly, except this one problem.

After sleep, the computer will lose connection to the graphics card, it cannot wake from sleep but I can log in through "share my screen" and I can see that the video card is no longer detected.

hi, I picked up a 2nd hand 2009 Macpro for the equivalent of $100USD, it was marked as non working.
After I put in my own RAM and Video cards everything seems to be running properly, except this one problem.

After sleep, the computer will lose connection to the graphics card, it cannot wake from sleep but I can log in through "share my screen" and I can see that the video card is no longer detected.

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